High-Order Modulation Signal Generator and Its DSP Implementation
Yecai Guo, Lijian Cai, Xiang Wang · 2017
In recent years, the low-order modulation signal cannot meet current demands due to the band tension and high demand of data transfer rate.In this paper, a higher-order modulation signal generator based on software-defined radio idea was designed.The design implements an efficient plan based on DDS technology by combining the TMS320C5509 chip with CPLD, which can send and receive signals and do floating-point data operation by the method of a 16-bit fixed-point DSP calibration.The validity of the proposed method has been verified by CCS simulation of the 64 QAM, 128 QAM and 256 QAM signal constellation graph mapping.